CVE-2026-46689Public exploitNetwork attack vector

Unauthenticated process abort via SCIM filter recursion

Published Jun 10, 2026 · Updated Jun 10, 2026

Uncontrolled recursion in Kanidm before 1.9.3 allows remote attackers to abort kanidmd through a crafted SCIM filter. The recursive-descent PEG grammar in proto/src/scim_v1/mod.rs parses nested parentheses and not expressions without a depth limit until Rust exhausts the worker thread stack and aborts the process. Parsing occurs in axum's Query extractor before handler execution or ACL checks, so one unauthenticated request interrupts the entire identity service.

CVSS severity8.7
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Kanidm before 1.9.3 allows remote attackers to abort kanidmd through a crafted SCIM filter. The recursive-descent PEG grammar in proto/src/scim_v1/mod.rs parses nested parentheses and not expressions without a depth limit until Rust exhausts the worker thread stack and aborts the process. Parsing occurs in axum's Query extractor before handler execution or ACL checks, so one unauthenticated request interrupts the entire identity service.

The record

CVE
CVE-2026-46689
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Kanidm
Product
Kanidm
Classifications
CWE-674, CWE-400, CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kanidm · Kanidmversion=< 1.9.3

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
CWE-400Uncontrolled Resource Consumption
CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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